From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Power curve graph for a 4 1/4 Litre Bentley engine comparing two different induction systems.
| Identifier | ExFiles\Box 99\1\ scan0017 | |
| Date | 1st January 1933 guessed | |
| 4 1/4 LITRE BENTLEY POWER S 32. COMP. RATIO- 6.3:1 (E.W. 1296) ① STD. WRAITH INDN. SYSTEM (SINGLE D.C. 42 STROMBERG) ② AS ① BUT WITH SINGLE HORIZONTAL S.U. B II Nọ 1 UNIT SPEC:- REDLINE PETROL COMPLETE B II EXHAUST SYSTEM B.H.P. B M.E.P. R.{Sir Henry Royce} P. M.{Mr Moon / Mr Moore} | ||